Question

Which of the following is more acidic in nature?

• A. $HClO$
• B. $HCl{{O}_{2}}$
• C. $HCl{{O}_{3}}$
• D. $HCl{{O}_{4}}$

Answer 1

Answer: (D)

$HCl{{O}_{4}}$

Answer 2

The acidity of oxyacids of halogens increases with increase in oxidation state of halogen.
Oxidation state of $Cl$ in $HClO =+1$
Oxidation state of $Cl$ in $HClO _{2}=+3$
Oxidation state of $Cl$ in $HClO _{3}=+5$
Oxidation state of $Cl$ in $HClO _{4}=+7$
$\because$ Oxidation state of chlorine is highest in $HClO _{4}$
$\therefore HClO _{4}$ has highest acidity among oxyacids of chlorine.